20747989760 has 72 divisors (see below), whose sum is σ = 51041222736. Its totient is φ = 8074874880.

The previous prime is 20747989733. The next prime is 20747989789. The reversal of 20747989760 is 6798974702.

It is a self number, because there is not a number n which added to its sum of digits gives 20747989760.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 171686 + ... + 266405.

Almost surely, 2^20747989760 is an apocalyptic number.

20747989760 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20747989760 is an abundant number, since it is smaller than the sum of its proper divisors (30293232976).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20747989760 is an equidigital number, since it uses as much as digits as its factorization.

20747989760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 438149 (or 438135 counting only the distinct ones).

The product of its (nonzero) digits is 10668672, while the sum is 59.

The spelling of 20747989760 in words is "twenty billion, seven hundred forty-seven million, nine hundred eighty-nine thousand, seven hundred sixty".